I wonder if it will turn out to be a version of KenKen? Have you had a go at it? There are a couple of puzzles on the Times online puzzle section everyday. Since seeing it there, I have seen it pop up under slightly different names on various puzzle sites. Just a thought.

KenKen's are available if you go to timesonline.co.uk and search kenken. also i got many free KenKen's at http://kenken.com. Not sure about kendoku as a name--it seems it should be sudoku with math, not a copy of kenken.